A sorter one I would like to think, there is an Au where kakashi doesn't reader porn, but it's just a distration to the people around them, while he make sure the area is clear of threats. I would be funny is his students found out, because they the bell test again and he didn't cover his hears or eyes... and dropped hints mutiple of him not actally reading them, by bullshiting through the question about the book.
It would be like Naurto got him a pre-realse of the book for him, was for nothing...